Special Features
Electrical Specs
25 Watts
AA25N
Ideal for telecom/networking
applications
High efficiency
Unencapsulated 2.0" x 2.0" x 0.50" package.
Integral heat spreader available
100C Baseplate temperature
Enable (on/off)
Thermal protection
350kHz Switching frequency
Under voltage lockout
Input
Input range
18-36 Vdc (24 Vdc nominal)
36 - 75Vdc (48Vdc nominal)
Input capacitance
2mF typical
Input reverse voltage
protection
Fuse recommended
Input surge voltage
100V for 100mS (048L)
50V for 100mS (024L)
36V for 100mS (012L)
Input reflected ripple
<10mA (P-P)
See Note 2
Undervoltage lockout
Vin<32V (-048L ONLY)
Efficiency
82% typical
Output
Voltage tolerance
Main Output
1.0%
Aux Output 3.0%
Dual Output 2.0%
Line regulation
Main Output
0.1%
Aux Output 0.5%
Dual Output 0.2%
Load regulation
Main Output
0.75%
Aux Output 3.0%
Dual Output 0.5%
(10% to 100% load) Note 6.
Noise/ripple
50mV P-P, Singles
100mVp-p, Dual , Triple
Short circuit protection
Continuous power cycle
Overvoltage protection
120% of V0, Typ
Transient response
2% Vo typ; recovery <500msec typ
(25% step load change to within 1%Vo)
Temperature coefficient
0.2%/C
Switching frequency
350kHz
Control
Enable
on =2.5 to 5.5Vdc or open circuit
off = 0 to 0.8Vdc
Ref. to -Vin. TTL compatible
Input current (enable OFF) <10ma
Output trim
Single output models
Thermal shutdown
110C Baseplate temperature (typ)
Auto reset
Isolation
I/O isolation
1500Vdc
Isolation resistance
15 x 108 ohms
Environmental
Total Power:
25 Watts
Input Voltages:
24V or 48V
No. of Outputs:
Single, Dual, Triple
Operation case temperature range: -40C to
+100C
Storage temperature: -40C to +125C
Humidity: 5% to 100%
Safety
UL
UL1950
CAN
CAN22.2-950
TUV
EN60950
A
s
t
e
c
C
o
n
v
e
n
tional
Pow
e
r
America's (USA): 1-888-41-ASTEC
Europe (UK): 44 (1384) 842-211
Asia (HK): 852-2437-9662
70
W9959_02_DCDC_001-073_73 2/8/02 3:56 PM Page 70
EUROPE
Astec House, Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX, UK
Telephone: 44 (1384) 842-211
Facsimile: 44 (1384) 843-355
AMERICAS
5810 Van Allen Way
Carlsbad, CA 92008
Telephone: 760-930-4600
Facsimile: 760-930-0698
Ordering Information
ASIA
Units 2111-2116, Level 21
Tower1, Metroplaza
223, Hing Fong Road
Fwai Fong, New Territories
Hong Kong
Telephone: 852-2437-9662
Facsimile: 852-2402-4426
Input
Output 1
Output 2
Output 3
Output
Model Number
VDC
Voltage
Voltage
Voltage
Power
18-36
12V @ 2.08A
25W
AA25N-024L-120S
18-36
15V @ 0.83A
-15V @ 0.83A
25W
AA25N-024L-150D
36-75
3.3V @ 6A
19.8W
AA25N-048L-033S
36-75
5V @ 5A
25W
AA25N-048L-050S
36-75
5V @ 5A
3.3V @ 6A
25W
AA25N-048L-050D033
36-75
5V @ 2.5A
12V @ 0.52A
-12V @ 0.52A
25W
AA25N-048L-050T120
Notes:
Max output power not to exceed 25W total. The sum of output currents not to exceed 6 Amps.
Any output loading ratio within the maximum specified limits is possible.
Single Output
1. +Vin
2. -Vin
3. No Pin
4. Enable
5. No Pin
6. V1 Out
7. Comm
8. Trim
Triple Output
1. +Vin
2. -Vin
3. No Pin
4. Enable
5. V2 Out
6. V1 Out
7. Comm
8. V3 Out
Dual Output
1. +Vin
2. -Vin
3. No Pin
4. Enable
5. V1 Out
6. Comm
7. V2 Out
8. N/C
Notes:
1. 20 MHz bandwidth. An external 2.2mf ceramic
capacitor is recommended to be placed from +V out
to -V out.
2. 12V and 24V Input models require external capacitor
connected between +V in and -V in to meet FCC class
A and ETS300-386-1 requirements for conducted
noise. Consult Factory for filtering information to
meet FCC class B , VDE or EIC specifications.
3. All specifications are typical at nominal line, full load,
and 25 C unless otherwise noted.
4. All specifications subject to change without notice.
Mechanical drawings are for reference only.
5. Please refer to the Technical Reference Notes for more
information.
6. Balanced loads on dual and Aux output voltage.
7. Warranty: 1 yr
Case material: Metal base/cover
Weight: 2.5 Oz / 68Gr.
Pin Assignments
A
A25N
A
s
t
e
c
C
o
n
v
e
n
tional
Pow
e
r
2.0
(50.8)
.10
(2.54)
.90
(22.86)
.40
(10.16)
2.00
(50.8)
1.80
(45.72)
1
2
4
6
7
8
.040 (1.01)
DIA. TYP.
.20 (5.0)
MIN.
.52
(13.2)
3
5
.015 (.38)
MIN.
.40
(10.16)
2.00
(50.8)
.40
(10.16)
.40
(10.16)
.40
(10.16)
71
www.astec.com
W9959_02_DCDC_001-073_73 2/8/02 3:56 PM Page 71
PDF 
ZIP